A Simple Tool for Stair Code Compliance: The Wooden Block Method
Ensuring your stairway complies with building codes is crucial for safety and avoiding costly rework. While tape measures are essential, a simple block of wood can be a powerful tool for quickly checking key dimensions and identifying potential violations.
Creating Your Stair-Checking Block
Choose the Right Wood: Select a sturdy piece of wood, like a 2x10 or a piece of plywood.
Determine the Dimensions:
Length: The block should be slightly longer than the expected tread depth (e.g., 12 inches).
Height: The block should be slightly taller than the expected riser height (e.g., 8 inches).
Mark Key Measurements:
On one side of the block, clearly mark the maximum riser height allowed by your local building code (e.g., 7 3/4 inches).
On an adjacent side, mark the minimum tread depth (e.g., 10 inches).
You can also add markings for common riser heights and tread depths to speed up your checks.
Using the Block for Code Compliance
Checking Riser Height:
Place the block against a riser, aligning the marked edge with the top of the tread nosing.
If the top of the riser exceeds the marked line, the riser is too high and violates code.
Checking Tread Depth:
Place the block on the tread, aligning the marked edge with the nosing.
If the front of the next tread nosing doesn't reach the marked line, the tread depth is insufficient.
Checking for Variations:
Use the block to quickly compare riser heights and tread depths throughout the stairway.
If you notice significant discrepancies, measure precisely with a tape measure to determine if the variations exceed the allowable limits (typically 3/8 inch).
Why This Method is Helpful
Speed and Efficiency: Quickly identify potential code violations without needing precise measurements for every step.
Visual Aid: The block provides a clear visual reference for allowable dimensions.
Easy to Use: Even DIY homeowners with limited experience can use this method effectively.
